Cooler



FIG. 1 is a perspective view of a cooler;

FIG. 2 is a front side elevational view, the rear side elevational view being the mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a left side elevational view, the right side elevational view being a mirror image of the present invention.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a cooler, as shown and described. 